linux为repo 'AppStream'下载元数据失败

显示错误 

  • 为 repo 'AppStream' 下载元数据失败
  • 错误：为 repo 'AppStream' 下载元数据失败 

解决

查看网络有无连接，或者防火墙。

Centos8下载元数据失败(Cannot download repomd.xml: Cannot download repodata/repomd.xml)

背景

新装了Centos8操作系统，安装yum-utils时报错。

[parallels@localhost yum.repos.d]$ sudo yum install -y yum-utils 
CentOS Linux 8 - AppStream                                                0.0  B/s |   0  B     00:00    
Errors during downloading metadata for repository 'appstream':
  - Curl error (6): Couldn't resolve host name for http://mirror.cloud.aliyuncs.com/centos-vault/8.5.2111/AppStream/x86_64/os/repodata/repomd.xml [Could not resolve host: mirror.cloud.aliyuncs.com]
错误：为仓库 'appstream' 下载元数据失败 : Cannot download repomd.xml: Cannot download repodata/repomd.xml: All mirrors were tried

问题分析

经查询，CentOS8操作系统版本生命周期结束，Linux社区不再维护，需要还源。

解决办法

将yum源换为国内流行的阿里云

1）备份

cd /etc/repos.d/
sudo rename '.repo' '.repo.bak' /etc/yum.repos.d/*.repo 

2）从阿里云下载从阿里云下载

sudo wget https://mirrors.aliyun.com/repo/Centos-vault-8.5.2111.repo -O /etc/yum.repos.d/Centos-vault-8.5.2111.repo
sudo wget https://mirrors.aliyun.com/repo/epel-archive-8.repo -O /etc/yum.repos.d/epel-archive-8.repo

3）替换源链接

sed -i 's/mirrors.cloud.aliyuncs.com/mirrors.aliyun.com/g'  /etc/yum.repos.d/Centos-vault-8.5.2111.repo 
sed -i 's/mirrors.cloud.aliyuncs.com/mirrors.aliyun.com/g'  /etc/yum.repos.d/epel-archive-8.repo

4）清除并更新缓存

yum clean all && yum makecache

5）验证

sudo yum update

总结